Prev: [patch] percpu in linux-2.6.35-rc3
Next: percpu in linux-2.6.35-rc3
From: Peter Zijlstra on 16 Jun 2010 11:00
On Wed, 2010-06-16 at 16:40 +0200, Stephane Eranian wrote:
> The reason is that perf reports an estimate based on the
> number of bytes written to the buffer divided by the minimal
> sample size of 24 bytes.

Right, we should change that based on the PERF_SAMPLE flags used. It
will remain an estimate due to the out of band events, but it should be
closer than assuming the minimal sample size.
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo(a)vger.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/
From: Peter Zijlstra on 16 Jun 2010 11:00
On Wed, 2010-06-16 at 16:40 +0200, Stephane Eranian wrote:
> This leads me to another point. For per-thread sampling, why
> do we need to record mmap() events happening *outside* of
> the process? I can understand the exception of kernel modules.

How does that happen? The per-thread events should be on the per-task
context, so another task's mmap() events should never end up there.
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo(a)vger.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/
 | 
Pages: 1
Prev: [patch] percpu in linux-2.6.35-rc3
Next: percpu in linux-2.6.35-rc3